Download Quantum Numbers and Atomic Orbitals Sect~on4 2

Name
_
Class
Quantum Numbers
and Atomic Orbitals
Date
42
Sect~on
ReVIew
•
DIRECTIONS: Write on the line at the right of each statement the letter preceding the word or expression that best
completes the statement.
1. How many quantum numbers are used to describe the energy state of an electron in an atom?
(a) 1 (b) 2 (c) 3 (d) 4
__
2. A spherical electron cloud surrounding an atomic nucleus would best represent (a) an 5 orbital;
(b) a Px orbital; (c) a combination of Px and py orbitals; (d) a combination of an 5 and a Px
orbital.
1
2
3. The letter designations for the first four orbital quantum numbers with the number of electrons
per orbital at each sublevel are (a) 5:1, p:3, d:l0, and f:14; (b) 5:1, p:3, d:5, and f:7; (c) 5:2, p:6,
d:l0, and f:14, (d) 5:1, p:2, d:3, and f:4.
3
4. The number of possible orbital shapes for the third energy level is (a) 1; (b) 2; (c) 3; (d) 4.
4
5. The maximum number of electrons that can occupy the 5 orbitals at each energy level is
(a) two, if they have opposite spins; (b) two, if they have the same spin; (c) one; (d) no more
than eight.
5
6. The spin quantum number indicates that the number of possible orientations for an electron
in an orbital is (a) 1; (b) 2; (c) 3; (d) 5.
6
7. The values + 1fz and -l/2 specify an electron's (a) charge; (b) main energy level; (c) speed;
(d) possible orientation in an orbital.
7
8. When n represents the principal quantum number of an energy level, the number of electrons
per energy level is (a) n; (b) 2n; (c) n2; (d) 2n2•
9. At n
8
= 1, the total number of electrons that could be found is (a) 1; (b) 2; (c) 6; (d) 18.
DIRECTIONS: Write on the line at the right of each statement the word or expression that best completes the
meaning when substituted for the corresponding number.
I
10. The quantum number that indicates the position of an orbital about the three axes in space is
the -1!QL quantum number.
10
11. The ~
11
orbitals are dumbbell-shaped and directed along the x, y, and z axes.
12. The number of different sublevels within each energy level of an atom is equal to the value of
the --.UlL quantum number.
13. There are ~
12
orbitals for the d sublevel.
13
14. ---.iHL electrons are needed to completely fill the fourth energy level.
15. A particular main energy level can hold 18 electrons. In this case, n equals ~
Quantum Numbers and Atomic Orbitals
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I
9
14
.
15
Section 4.2
13
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Name
_
Class
Date
_
43
Sect~on
RevIew
Electron Configurations
•
DIRECTIONS: Write on the line at the right of each statement the letter preceding the word or expression that best
completes the statement.
1. The correct sequence in ascending energies of atomic sublevels is (a) 4d, 5s, 5p, 6s;
(b) 5s, 4d, 5p, 6s; (c) 5s, 4d, 6s, 5p; (d) 5s, 5p, 4d, 6s.
1
2. The statement that an electron occupies the lowest energy orbital that can receive it is
(a) Hund's rule; (b) the Aufbau principle; (c) Bohr's law; (d) the Pauli exclusion principle.
2
3. In the correct electron-dot notation for the phosphorus atom (atomic number 15), the symbol
P is surrounded by (a) two pairs of dots and a single dot; (b) three pairs of dots and a single
dot; (c) one pair of dots and three single dots; (d) two pairs of dots.
3
4. The electron-configuration notation for scandium (atomic number 21) would show the three
highest energy electrons to have the notation (a) 3d14s2; (b) 4s2; (c) 3d3; (d) 4s24pl.
4
5. The element with the electron-configuration notation li2i2p63i3p2
(b) P (z = 15); (c) S (z = 16); (d) Si (z = 14).
is (a) Mg (z
= 12);
5
6. In the correct electron-dot notation for sulfur (atomic number 16), the symbol S is surrounded
by (a) three pairs of dots; (b) two pairs of dots and two single dots; (c) four single dots;
(d) two pairs of dots.
6
7. If the highest main energy level of an atom has the sand p orbitals filled with electrons, it is
said to have a(n) (a) electron pair; (b) octet; (c) ellipsoid; (d) circle.
7
8. The noble gas configuration is an outer main energy level fully occupied by (a) 32 electrons;
(b) 8 electrons; (c) 2 electrons; (d) 64 electrons.
8
DIRECTIONS:
Complete the following statements, forming accurate sentences.
"-
9. The atomic sublevel with the next highest energy after 4p is
.
9
10. "Orbitals of equal energy are each occupied by one electron before anyone orbital is occupied by a second electron
and all electrons in singly occupied orbitals must have the same spin" is a statement of
. 10
11. The electron-dot notation for an element in the third period is represented by a symbol surrounded by a pair
.of dots and a single dot. The complete electron configuration for this element is 1~2~2p6
. 11
12. The electron configuration for the carbon atom (C) is Is22s22p2. The atomic number of carbon is
. 12
13. The electron-configuration
. 13
notation for the element with atomic number 11 is
14. The number of electrons in the highest energy level of the argon atom (atomic number 18) is
. 14
15. An element with eight electrons in its outermost main energy level is called a(n)
. 15
14
Section 4.3
Electron Configurations
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